Case Study: nZEC - Energy refurbishment of 40 dwellings in Võidu Street, Rakvere, Estonia (UNDER MONITORING)
Name of organisation: EKÜL - The Estonian Union of Co-operative Housing Associations
Stage of development: completed
Year of finalization: 2012
Type of project: refurbishment
Area: urban
Scale: individual buildings
Type of building: Apartment in a block of five or less stories
Number of units/dwellings: 40
Tenure: shared ownership/cohousing
Street: Võidu str
Postcode: 42
City: Rakvere
Region/ County: Lääne Virumaa
Country: Estonia
Last Update: 23.02.2015
Short Description
The project was carried out because of high price for heat and uncomfortable indoor climate. Heating system was one pipe system with no possibility to regulate on the radiator level. Ventilation was designed as natural from windows, but due to the fact that most of the appartements have already changed windows the natural ventilation does not worked properly any more. Heating system was unbalanced and heat supply to the radiators was unstable. At the same time support scheme for renovation was available.
Scheme terms were connected with energy saving % compared with last 3 years consumption. 25% investment support means 40% energy savings and 35% investment support means 50% savings. Association general meeting decided to go on 35% investment support. Flat owners are mainly pensioners with reasonable low income (about 300 EUR month). Conditions foreseen that renovation should consist from total insulation of all external walls (U value 0,2) and roof (U value 0,15), installation of windows with U value not higher than 1,1. Heating system should be regulated on the radiator level, ventilation should have heat recovery element. Renovation project was designed for these conditions. Ventilation system was designed to use heat pump for recovering exhaust air energy.
Key Elements
Certification
Energy certificate.
Project Management
Monitoring service quality.
Work with Residents
Site visits together with community members.
Funding
Energy efficiency measure | Ir | Iee,brutto [€] | Iee,netto [€] | Life time [years] |
[€] | ||||
1 Additional insulation for all external areas (roof 200 mm, walls, fundament with 150 mm of insulation) |
| 131 000 | 65 500 | 40 |
2 Replacement of all old windows (U value more than 2 replaced with U value less than 1,1) |
| 12 000 | 7 000 | 30 |
3 One-pipe heating system was replaced by two-pipe system with thermostatic valves. |
| 65 000 | 16 250 | 40 |
4 Heat recovery ventilation system installation (heat pump for using exhaust air heat to produce heat for hot tap and heating system) |
| 86 000 | 86 000 | 20 |
Total |
| 294 000 | 174 750 |
|
Running costs |
| 13 700 | 13 700 |
|
Simple pay back time |
| 21 | 13 | 30 |
Capacity Building
Private energy auditing and public research from Tallinn Technical University for typical block houses.
Thermal Insulation
Thermal insulation system (insulation+cover), elimination of thermal bridges with full insulation.
Monitoring
Click here to access the monitoring data on the HIVE Database!
Main Results
The most important is that flat owners got comfortable living with high quality indoor climate and with the same annual expenditure like before renovation. The apartments value is higher and house main constructions are now protected and there is no thermal bridges. Ventilation system will use exhaust air heat, heat consumption is 50% less than before.
Lessons learned
- Importance of accurate and detailed technical project for renovation. Good project helps the association to ask tenders from construction companies and to compare different offers and helps construction companies to make tenders to the association. Good project is also the basis for effective control and supervision during the renovation process. Therefore the detailed technical project for renovation accelerates the organizational processes for renovation.
- Importance of preparation for general meetings of apartment association. The meetings are prepared by the board with help from energy expert and project manager and the materials should offer all information for owners to make the decisions for renovation.
Additional Information
Ms Anu Sarnet
EKÜL - The Estonian Union of Cooperative Housing Associations
E-mail: anu.sarnet@ekyl.ee
Web: www.ekyl.ee
